Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffcbe5ede54d849…

MALICIOUS

PDF

6.6 KB
MD5: 3df4d0264c8b5821b19ab3a93bfc354a SHA-1: 207f973812b166bde4f6d3a9da58e9c3baab5591 SHA-256: 4ffcbe5ede54d849c851164dcb2106a83b73c0a2f91e04a253f1ab400dc51c49
118 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains embedded JavaScript that utilizes the `unescape()` function and a `util.printf()` call, indicating exploitation of CVE-2008-2992. This vulnerability allows for arbitrary JavaScript execution within the context of the PDF viewer. The primary intent appears to be the execution of malicious JavaScript, likely to download and execute a secondary payload.

Heuristics 6

  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (matched in decompressed stream)
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000325.bin
3b2c1278662df9482a4a95e4b96cda1b0f3d8e0bd01841f817825805893ed09b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x325 1175 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
stream_003_off0000065b.bin
3e6e812004c59f1360e44da8103d883826378dfabe7ce306213ebb1a8670dc74		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x65B 407 bytes

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